Theodore brand



(No Model.) 2 Sheets$heet 1.

T. BRAND.

LOOK. No. 596,473. Patented Jan. 4,1898.

IIIIIIIIIL'I l wumm M2166 g, anmm 2 SheetsSheet 2.

T. BRAND.

LOOK.

(No Model.)

Patented Jan. 4,1898.

C ZW w 31 7 NITED STATES PATENT OF ICE.

THEODORE BRAND, OF BROOKLYN, NEIV YORK, ASSIGNOR OF ONEIIALF TO MAX FEHRMANN, OF SAME PLACE.

LOCK.

SPECIFICATION forming part of LettersPatent No. 596,473, dated January 4, 1898.

Application filed March 5, 1897,

To ttZZ whom it may concern: Be it known that I, THEODORE BRAND, a citizen of the United States, and a resident of Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Locks, of which the following is a full, clear, and exact specification, reference being had to the accompanying drawings, wherein Figure 1 is a top View of my improved lock. Fig. 2 is a side elevation, partly a section thereof; Fig. 3, a transversal section on lines 3 3, indicated in Fig. 1. Fig. 4 is a plan of the lock; Fig. 5, a transversal section on line 5 5, indicated in .Fig. 2. Fig. 6 is a similar view showing the-position of the parts of the look after the key passed through the first stage. Fig. 7 is a similar View showing the position of the several parts of the lock with the key inserted in the lock. Fig. 8 is an elevation of the key, made in the shape of a crank. Fig. 9 is a sectional view similar to that in Fig. 5, showing modified arrangements of the parts in the keyway.

My invention relates to looks and locking devices; and it consists of a safety attachment to a lock having the purpose to prevent the picking of the lock by means of a skeleton y- Y My invention is adaptable to any kind of a lock, whether a spring-bolt or latch or an ordinary door-lock or any lock of such varieties as are used for safes, desks, or safe-closets.

In the accompanying drawings I have shown my invention adapted to spring-locks such as are generally used on doors. The mechanism of the lock consists of 7 bolt a, springs s and s, catcher c, and case I). These parts are those of the ordinary pattern and construction and are not claimed as parts of my invention.

The safety attachment claimed as my invention consists of the following: Oppositely to keyhole f and h I provide a circular flange b in the case of the lock and a circular hole d in corresponding position in the plate d, covering the case b of the lock. In this circular flange Z) is set a plug 6, having its upper end recessed and snugly fitted into the hole d of the plate d. To this plug e is secured (or produced in one piece therewith) Serial No. 626,041. (No model.)

the arm 6', which is shaped according to the construction of the lock and serves the same purpose as the ward of a key. It may be made in the shape as shown in Fig. 4 of the drawings and adapted to engage the upward lybent end a" of the bolt a or it may be provided with clefts or grooves, as the constructionof the lock may require. 7

Above the plate (1, covering the mechanism of the lock, is arranged a second plate f, which is provided with a circular keyhole f in concentrical position with the hole d. This hole f is normally covered by the sliding plate g, held in its position above the hole f by springs g, and .by a flexible wire fabric g secured to the plate f by pin 9 Plate f and also plate It, surmounting it, are each provided with a slot 2', as shown in Fig. 1.

Upon the plate h, which is alsoprovided with a circular hole h in corresponding position above the holes f and d in plates f and d, respectively, is set the tubular keyway'j concentrically with the hole h, and in it are provided the two blocks and Block 7c is stationary, preferably soldered in the mouth of the keyway,whereas block 7r slides therein.

The ends of the frame 5 pass through the slots m, provided on both sides of the tubular keywayj, and are secured to the sliding block 70'. Spiral spring 72, wound around the key- Way or'set inside thereof, as shown in Fig. 9, supports the sliding block 70 and also the frame Z in their normal. position.

Blocks 7c and 7t and also plug 6 are provided with screw-threads, preferably of different pitch and grade and arranged changing from right to left, or vice versa. These screw-threads in the blocks is and 7t and plug 6 may be varied almost indefinitely; also, additional sliding blocks, as 76, may be set in the keyway or between the plates (1 and f, as may be required for greater complication of the combined safeguard.

The key 0 to be used for the operation of this look consists of a slender stem 0, provided with screw-threads q and q, (and with as many more as may be necessary for the purpose of a combination,) arranged in corresponding order with the blocks 70 and 7t, and with screw-threads g on the end of the stem of the key corresponding with that of the plug 6. The key may be in the shape of an ordinary key, as shown in Figs. 6 and '7 ,-or it may be in the shape of a crank, as'shown in Fig. 8.

In the construction shown in the drawings the screw-thread in the blocks and It runs from left to right and the screw-thread in the i plug 6 from right to left. This is the simplest arrangement of a combination.

To insert the key in the lock protected by this combination, it is necessary, first, to screw the thread q through the stationary block 70,. Then by pushing the key as far as it will go the block is is pressed down-ward, as shown in Fig. 6, and while held so in suppressed ,po-

sition the key is drilled through this block. ,7 With the sliding block it the frame Z is moved downward and, acting on the flexible band 9 I draws the plate 9 from its normal position, thereby'freeing hole f for the'key to slide into it when screwed through the block it. Screwthread g on the end of the stem of the key is then screwed into the plug 6, and when their connection is sufiiciently rigid the key will turn the plug and move'the arm a as may-be required to operate the lock.

The access tothe keyhole may be covered by aplate of any construction or by a screwblock. The number of the blocks in the keyway and the arrangement of the "different screw-threads may be varied, as already explained above. The combination described there and shown in the drawings is only one example of the application of the principle'of my invention.

The construction shown in Fig. 9 is modified, inasmuch as the springn is set inside of the keyway directly underneaththe block it and between itand the flange j, and in substitution for the flexible band g a bell-crank t is pivoted to the keyway. One arm of this bell-crank is connected by rod Z to block 70 and the other to an eye 9 attached to, plate g. This arm passes through slot k provided in plate h, transmittingto the plate 9 the motion of the block 7c, connected to its other arm. In this construction springsg' are In the same manner spring n might omitted.

also bedispensed with if the springs gare restored and made sufficiently strong to return block 70' to its normal position.

Having thus fully described the principle of my invention and the manner of its application for the purpose stated, I claim as my hole, and secured in the mouth of the keyway, a sliding block (or blocks) provided with screw-threaded apertures for the passage of the key, set in the keyway between the stationary block and the plate, a spiral spring supporting this block or blocks in normal position and means for moving the slide from its normal position by pushing the sliding block downward.

2. The combination with a lock, provided with a plug set turnably in the lock and having an arm adapted to operate the bolt, a

slide, covering the aperture for the passage of the key into the lock, springs holding the slide in its normalposition and returning it thereto automatically, a plate set above the slide and provided with an aperture for the passage of the key in corresponding position,

'a tubular keyway secured to this plate, a stationary block provided with a screw-threaded hole, and secured in the mouth of the keyway, a sliding block (or blocks) provided with screw-threaded apertures for the passage of the key, set in the keyway between the stationary block and the plate, a spiral spring supporting this block or blocks in normalposition and means for moving the slide from its normal position by pushing the sliding block downward, of a key provided with screw-threads of different sizes, pitch and grade, corresponding with'the size, pitch and grade of the screw-threads provided in the blocks and in the plug set in the look.

In witness that I claim the improvements described in the foregoing specification Ihave signed'my name in the presence of two subscribing witnesses.

THEODORE BRAND. \Vitnesses:

A. W. KURZ,

HARRY CALHOUN. 

